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I guess I won't be forgetting about hosts.allow next time.

This is one case where ping will work but TFTP will fail, even with no firewall running. From the root prompt/command line of the Digi unit run the command to upload the firmware: > boot load (tftphost): (firmwarefilename) Last updated: Jun 06, 2019. Next, run the TFTP Server: Start > Programs > Open TFTP Server > Run Stand Alone. The routers that were one hop away used that allowed network to get back to the TFTP server (via static routes on the cable router), but the one router directly connected was on a network not listed in hosts.allow (and I have ALL:ALL in ny). Once installed, copy the firmware image to the C:OpenTFTPServer directory on your computer. Note: The Microsoft Windows-based TFTP server previously provided. This document provides tips on how to select and use a TFTP server. SolarWinds TFTP server option has a couple notable advantages the first and foremost of which will be most apparent to anyone using other SolarWinds technology. There are many freeware Trivial File Transfer Protocol (TFTP) servers on the Internet which are able to perform maintenance activities on Cisco products, such as upgrades to Cisco IOS® software on Cisco routers. In my case, I found that my hosts.allow file on the TFTP server box was only configured to allow the network with the cable router and no other networks. Cisco TFTP (Discontinued) Spiceworks TFTP Server. One of my routers was directly connected to the network with the raspberry pi and it was NOT connecting! It could ping the IP address just fine, but no TFTP. Two of my routers were each one hop away from the TFTP server (a raspberry pi).

I had to enter static routes on the dlink to get packets back to the cisco routers. I have them all connected to my cable internet router (dlink dgl-4500). I have 3 routers (two 1841's and one 2801) and 3 switches (all 2950's) for my CCNA lab at home.